Really it is doing in a different and often better way what the seismograph does.
Hence the tiny fluctuations of Hilary Vane's seismograph an instrument, as will be shown, utterly out-of-date.
The seismograph of to-day, however, has reached a stage of perfection where close approximations are obtained in the records made.
Cheyney was bent over a seismograph, echo-sounding for the egg through the river bottom.
The seismograph, as you know, was devised to register earthquakes at a distance.
When this is done, however, I trust that due notice will be given, so that the seismograph stations may have fair warning.
But even at noon the disturbance had not subsided, as slight shocks are recorded at frequent intervals on the seismograph.
In order to get a record of the successive shocks another form of apparatus must be employed, a form known as a seismograph.
The following brief account of his seismograph will, therefore, form a not unsuitable complement to his Memoir.
In recent years much information has been obtained by the investigation of earthquakes by various kinds of seismograph.
An instrument that detects and records vibrations and movements in the Earth, especially during an earthquake. Most seismographs employ a pendulum mounted within a rigid framework and connected to a mechanical, optical, or electromagnetic recording device. When the Earth vibrates or shakes, inertia keeps the pendulum steady with respect to the movements of the frame, producing a graphic record of the duration and intensity of the Earth's movements. Separate instruments are needed to record the north-south horizontal, east-west horizontal, and vertical components of a tremor. By comparing the records produced by seismographs located in three or more locations across the Earth, the location and strength of an earthquake can be determined.